Wireless-telegraph transmitter.



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PATENT OFFTCE.

HARRY SHOEBLLXKER, OF J ERSEY (.ll'llY, NElV JERSEY, ASbIG` NOR TOINTERNATIONAL rlELEGRAPll CONSTRUU ION C(.)T\IPANY, OF N EW YORK,

N. Y., A OORPORAHON OF NEr YORK.

WlRELESS-TELEGRAFH TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 787,057, dated April11, 1905.

Application tiled July 29,1904. Serial No. 218,596.

be it known that l, Hanni' Suorm.\klu:, a citizen ot the United States,residing' at Jersey (lity, in the county ot' lludson and State ot' NewJersey, have invented a new and usetul \l'ireless-'l`eleg'raphrTransmitter, ot which thi` following' is a specilication.

My invention relates to apparatus t'or use in wireless telegraphy, moreespecially those systems in which the signalsl are represented during'the transmission by electroradiant energy.

More particularly, my invention consists ot' transmitting' apparatus sodisposed and a1'- ranged that it is easily portable, compact, and

capable ot being' quickly set up and adjusted.

)ly invention consists also ot' the parts ot an (.)scillating'circuit socombined as to occupy minimum space and be easily portable andadjtlstablt.

Reference is to be had to the accompanying' drawings, in which Figure 1is a vertical elevational view, partly in section, ot' my apparatus.Fig'. 2 is adiag'rammatic view otl the circuit arrangement. Fig. 3 is avertical sectional view of the inductance and spark-gap chamber'. Eig. iis an enlarged view ot' the connection toa sparlv g'ap terminal. Fig'. 5is a top plan view otl the Leyden jars. Fig'. 6 shows the clip forengaging' the inductance.

Referring' lirst to Fig. Q, G represents a source ot alternatingcurrents or other suitable electrical energy. l? is the primary ot' atransformer or induction-coil included in the circuit ol` ii, and l( isan operators key for controlling' said circuit. S is the secondary ofthe transformer, whose terminals are bridged by the two groups ot'Leyden jars J J, these groups being' connected in series with each otherand each g'roup consisting' ot' a plurality ot' jars connected inparallel with each other. E is the earth connection made at a pointcommon to the two groups ol jars. L is an inductance, whose one terminalis in electrical communication with the spark-gap terminal f and whoseother terminal connects by conductors c with one terminal ot' the groupl ot' jars J. is the other spark-gapterminal, which is in electricalcommunication with a terminal ol theI group ot' jars J. A is the usualaerial conductor ot' a wireless-telegraph system. 'lhe inductance Lforms with the groups ot'jars J J, along' with the spark-gap terminalsan oscillating circuit whose period is extremelyhig'h Vfas, tor example,from one hundred thousand to several millions per second. Upondepressing the key l( there are radiated fromA trains ot'electromagnetic waves, the Vfrequency ol' the waves being' as aforesaid.'l`he earth connection E may, however, be made to the terminal u, ifdesired, as in my prior patent, No. T-1,90%.

Referring to Eig. l, 1 is the bottom ot' a rack, made otl wood or otherinsulating material, having the side portions 2 and the top 3. On theupper side otI the bottom board l is a piece ot' sheet-copper or othermetal i. Upon the sheet 4f rest the Leyden jars 5, with the result thatthe outer coatings ot' all the jars are in electrical contact with eachother. l prefer to employ twelve jars arranged in two groups J J, sixjars in a group, all the jars in each group being' connected in parallelwith eachother. (5 is a disk of metal having' radiating therefrom thecopper rods 7, a rod T extending over the mouth ot' each jarot' theg'roup J. (SeeFig'. From each rod T there depends a chain or otherelectrical connection to the inner coating' otl a jar. 8 is abinding-post having' a connection extending through theinsulating'-bushing' 9, split horizontally, such connection secured tothe disk 6. 10 is a heavystrip ot' eopperextending' trom binding-post Sand held under the scre\\'head ll in electrical communication with themember 1Q, which in turn eng'ag'es in the brass bushing 13, held by nut11 to the member 15, supported in the circular member or head 1G, madeot' wood or other insulating' material. Screwed in the upper end oi' themember 12 is a spark-gap terminal 1T. The member le is supported on themember 3 by a tripod, two of whose leg'sare shown at 1S and 1S). Erectedupon the member Uf area plurality of members 20, ot' wood or otherinsulating material, and to the upper ends of these is secured anothermember or head 21, similar to 16. The heads 16 and 21, along with themembers 20, constitute adrum within which are located the spark-gapterminals. 22 is a member of brass or other suitable metal having thecylindrical portion 23 extending through 21 and having theupwardly-extending portion 24, whose outer surface is tapered andscrew-threaded. Extending axially through the'member 22 is the rod 25,of brass or other suitable material, and whose lower end forms the otherterminal of the spark-gap. On the upper end of rod 25 is a handle 26, ofhard rubber or other suitable material, by means of which the length ofthe spark-gap may be adjusted. To clamp the rod 25 in any desiredposition, the portion 24 has a plurality of radial slots extendingvertically and into the bore through which extends the rod 25. Thiscauses the portion 24 to be resilient, and when the hand-nut 27 isscrewed down on the tapering member 24 the segments of 24 are forcedinwardly and clamped to rod 25'. 28 is a metallic disk embracing themember 24 and lying in contact with 22 and the metallic collar 29 heldagainst 28 by forcing the screw 30 against 24. 28 is, however, loose andcapable of rotation with respect to 24, though maintaining electricalcontact with 24, and therefore with rod 25. 31 is a heavy copperconductor, preferably onefourth of an inch in diameter, which is securedat its one end to the member 28 and which is then coiled into a helix,shown at /L as supported upon a plurality of members 32, of insulatingmaterial, and held between said members 32 and the members 33, also ofinsulating material. This helix composed of the turns /L constitutes theinductance L. Shown in Fig. 2.) The other end of the helix simplyterminates in one of the members 32. The members 32 and 33 constituteaframe for supporting the helix, such frame being rotatable in thechannels 34 and 35, cut in the members 16 and 21, respectively. Thisstructure permits the entire helix to rotate to any desiredposition,electrical communication being maintained with the rod 25 bymeans of the member 28,as heretofore described. 36 is a springclip ofcopper or brass secured to the heavy copper strip 37, whose lower end isheld under the binding-post 38. The binding-post 38 eX- tends throughthe bushing 39, similar to 9, and connects with the disk 40,similar todisk 6. 41 designates a plurality of rods similar to rod 7 from whichdepend members 41', engaging the inner coatings of the jars in group J.42 is a binding-post in electrical communication with the copper sheet4, this binding-post being adapted to receive the earth connection, theaerial connection being made at binding-post 38, or to conform with theconnections shown in my prior patent aforementioned the aerialconnection may be made at 38 and the ground members 16 and21,1'espectively. This forms an inclosure around the spark-gap servingto muffle the noise created by the spark. 46 represents mica or similartubes affording means for circulation of air through the drum 43. At 47is indicated an orifice in the cylinder 43 at a point opposite thespark-gap in order to facilitate inspection of the spark.

From the foregoing' description it will be seen that I have provided acompact and portable arrangement of the elements of an oscillatingcircuit for use in wireless telegraphy or the like, such arrangementaffording means for adjusting the wave length of the transmitted energyand for adjusting the sparkgap as well. i

I do not wish to be limited to the precise arrangement of parts shown.inasmuch as numerous variations and modilications may be made withoutdeparting from the spirit and scope of my invention.

What I claim isA 1. In a wireless-telegraph transmitter, a rack, aplurality of Leyden jars mounted therein, a drum member mounted uponsaid rack, spark-gap terminals within said drum 'and mounted upon theheads thereof, and an inductance-winding surrounding said spark-gapterminals and supported by said drum.

2. In a wireless-telegraph transmitter, a rack, a plurality ofLeydenjars mounted therein, spark-gap terminals mounted upon said rack,and an inductance-winding surrounding said terminals and rotatable withrespect thereto and mounted upon said rack.

3. In a wireless-telegraph transmitter, a rack, a plurality of Leydenjars mounted therein, spark-gap terminals mounted within a drum, saiddrum being mounted upon said rack, and an inductance-winding rotatableupon said drum.

4. In a wireless-telegraph transmitter, a

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drum, spark-gap terminals within said drum l. In a wireless-telegraphtransmitter, a drum, spark-gap terminals mounted therein and supportedby the heads thereof, an ind uetancewinding surrounding' said spark-gapterminals, and rotatable upon said drum and means for maintaining'electrical communication between said winding and a spark-gap terminal.

T. In a wireless-telegraph transmitter, a condenser, a containertherefor, an induetance-winding supported upon said container, andspark-gap terminals surrounded by said winding'.

8. In a wireless-telegraph transn'iitter, a condenser, a containertherefor, spark-gap terminals supported upon said container, and aninductance winding surrounding' said spark-gap terminals and rotatablewith respect thereto.

9. In a wireless-teleg'raph transmitter, a condenser, a containertherefor, an ind uctauce supported upon said container, and means forrotatingl said inductance whereby the amount of induetanee cooperating'with said condenser may be Varied.

10. In a wireless-telegraph transmitter, a comlenser, a containertherefor, spark-gap terminals supported upon said container, anindiu'tance-wimling' surrounding' said sparkg'ap terminals andconnections for the radiating' conductor and earth at terminals of saidcomlenser.

1l. In a wireless-telegraph transmitter, a plurality of condensers, acontainer therefor, spark-gap terminals supported upon said container,an induetance-winding surrounding said spark-gap terminals, saidspark-gap, induclanee-wimling', and condensers being serially connected,and connections for the radiating' conductor and earth at the terminalsof a condenser.

12. In a wireless-telegraph transmitter, a plurality of Leyden jars inseries-parallel grouping', a container therefor, spark-gap terminalssupported upon said container, an induel'ancewinding surrounding saidspark- `e'ap terminals, and connections for radiating l l l l l l l l iconductor and earth at the terminals of a group of said Leyden jars.

13. In a wireless-telegraph transmitter, a plurality of Leyden jars, acontainer therefor, an inductanee-winding' supported upon saidcontainer, and spark-gap terminals surrounded by said winding'.

lst. In a wirelesstelegraph transmitter, a plurality of Leyden jars, acontainer therefor, an inductance-winding supported upon said container,spark-gap terminals surrounded bysaid winding, said Leyden jars, inductancewinding,l and spark-gap being' serially connected.

15. In a wireless-telegraph transmitter, a frame, an induetance\\'inding' supported thereon, spark-gap terminals supported by andsurrounded by said inductance-winding'.

16. In a wireless-telegraph transmitter, a frame, an inductance windingsupported thereon, spark -g'ap terminals supported thereby andsurrounded by said induetancewinding, and means permitting rotation ofsaid induetance-winding.

17. In a wireless-telegraph transmitter, a condenser, aeontainertherefor, an inductance supported upon said container, and means forrotatingsaid induetance, said inductanee and condenser being'fre1uenc\'-determining' elements of an oscillating eireuit.

18. In a wireless-telegraph transmitter, a condenser, a containertherefor, an induetance supported upon said container, spark-gapterminals supported upon said container and surrounded by saidinduetance, said spark-gap, induetance and condenser being' seriallyconnected.

19. In a wireless-telegraph transmitter, a condenser, a containertherefor, an inductance supported upon said container, spark-gapterminals surrounded by said inductance, and a mufiier surrounding' saidspark-gap terminals.

AeNns D. CUTTING, E. M. BRYAN.

